<!doctype html>
<html>

<head>
    <title>Socket.IO chat</title>
    <style>
        * {
            margin: 0;
            padding: 0;
            box-sizing: border-box;
        }
        
        body {
            font: 13px Helvetica, Arial;
        }
        
        form {
            background: #000;
            padding: 3px;
            position: fixed;
            bottom: 0;
            width: 100%;
        }
        
        form input {
            border: 0;
            padding: 10px;
            width: 90%;
            margin-right: .5%;
        }
        
        form button {
            width: 9%;
            background: rgb(130, 224, 255);
            border: none;
            padding: 10px;
        }
        
        #messages {
            list-style-type: none;
            margin: 0;
            padding: 0;
        }
        
        #messages li {
            padding: 5px 10px;
        }
        
        #messages li:nth-child(odd) {
            background: #eee;
        }
    </style>
</head>

<body>
    <ul id="messages"></ul>
    <form action="">
        <input id="m" autocomplete="off" /><button>Send</button>
    </form>
    <script src="https://cdn.socket.io/socket.io-1.2.0.js"></script>
    <script src="http://code.jquery.com/jquery-1.11.1.js"></script>
    <script>
        var socket = io();
       $('form').submit(function(){
         //io.emit提供给我们可以发送给所有人的事件io.emit('some event', { for: 'everyone' });
         socket.emit('chat message', $('#m').val());
         $('#m').val('');
         return false;
       });
       socket.on('chat message', function(msg){
         $('#messages').append($('<li>').text(msg));
       });
    </script>
</body>

</html>